[Bug] Some Indic fonts not filtering via Writing System & Language drop down menus on fonts.google.com

**Describe the issue**
Some font families with Indic script support are not showing up in the Writing System & Language drop-down menus on the website.

**To Reproduce**
1. Open fonts.google.com
2. Select 'Kannada' under the 'Writing Systems' drop-down menu under the 'Language' filter.
3. In the search bar look for 'Akaya Kanadaka'. You will see no result.
4. Now clear the 'Kannada' filter and you will see 'Akaya Kanadaka' as the first result.

**Expected behavior**
'Akaya Kanadaka' should show up when you filter results with Language -> Writing System -> Kannada

**Other Identified Families**
- [Farsan](https://fonts.google.com/specimen/Farsan) not showing up under Gujarati
- [Yrsa](https://fonts.google.com/specimen/Yrsa) not showing up under Gujarati
Note: This is not a complete list. There may be others.

cc: @davelab6 @chrissimpkins